If thats the case nothing works for your situation, But water powered
just makes sense, it out performs and works when needed. I also bet
the electric cost of a 24x365 charger is noticeable, figure in 5 years
of that, new batteries and crappy chargers that ruin batteries. It
should be called the Basement Bitch, it will make you pay and only
perform when happy.

Geez, talk about jumping to conclusions. I've seen lots of sump pump
installs where the water neither runs back in nor goes into the storm
sewer system. For example, it simply gets discharged 20 ft away and
disipates down a grade away from the house in the backyard.
Ransley's water powered recommendation could be a good solution,
depending on the specifics of the actual installation.

Am I crazy? In a real emergency (no electric) just how much
water can a single such battery be expected to pump? How much water
is it likely to need to pump. I suspect that it is likely any such
battery powered pump system is going to fall far short of the liekly
need.

We do have a generator that would run the main pump.
Claimed capacity of the "Basement Watchdog" unit is 1000gph with a 10ft
lift. The smaller of the two batteries is claimed to be able to run the
pump for 6 hrs continuously; the larger battery for 7.5 hrs continuously.
Perce

I found a 75AH sealed lead-acid battery with the "Campbell Hausfeld"
brand at Menards with the sump pumps. Not cheap, but it won't have to be
topped up -- and it fit in the bag, which got me a 15% discount.
Perce

I don't see that a charger fed from a 900mAH wall wart could do much
damage to a 75AH battery even if the controller circuit didn't switch
from "charging" to "charged" (i.e., stop charging) for long periods.
And the idea of the sealed lead-acid battery is that the hydrogen and
oxygen generated get recombined in the cell to form water again.
Perce

You need to learn about crappy chargers, a wall wart can put out
anything and everything, you think because its small it cant do harm,
thats funny. It can ruin a battery in less than a year if not
operating to the batterys specifications.

No. That is wishful thinking. Sealed just means you can't add water.
The hydrogen and oxygen still get boiled off, there is a vent
somewhere on that battery. 900ma at 120v is 9a at 12v. That can
definitely do damage.

--
A computer is] like an Old Testament god, with a lot of rules and no mercy. --
Joseph Campbell

900 ma 15 v continous will kill a battery, Float chargers cycle the
charge inbetween a set low peak and high peal level to maintain 100%
charge. www.batteryuniversity.com will help you to do your own testing
to see what is really going on in voltage. A new battery with your
same charger will give you a half dead battery in a few years. My
float charger and big battery charger I can adjust voltage and I have
as they drift over the years. I trust my V meter more than any
chargers accuracy.

There is a difference between sealed flooded cell lead acid and
recombinent AGM batteries.
Recombinent agm batteries are "starved electrolyte" batteries and
unless grossly overcharged do NOT lose water or boil dry.
They DO have a limited lifespan, but 5 years on a properly sized and
set up unit is not a stretch - and the charging system does not need
to be "sophisticated"

Hmmm, I believe the op was talking about a sealed lead acid, he didn't
mention AGM. I'm not sold on agm myself, I have one out in the garage
with one terminal corroded beyond the point of utility. Nice idea,
but just as bad as all the others from what I've seen.

--
A computer is] like an Old Testament god, with a lot of rules and no mercy. --
Joseph Campbell

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